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2 questions

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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2 questions

Unread postAuthor: The_Kangsta » Wed May 07, 2008 6:48 pm

Sorry for these noob questions, but i need them answered quickly.

1) would a 1/2 inch barrel choke flow from a 1 inch sprinkler valve?

2) would a small chamber like 20 inches of 1 inch pvc be able to lob something a fair distance like a 100 meters out of a 1/2 inch barrel a meter and a half long? (70-110 psi)

Thanks.
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Last edited by The_Kangsta on Wed May 07, 2008 6:53 pm, edited 2 times in total.
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Unread postAuthor: bigbob12345 » Wed May 07, 2008 6:52 pm

1. Depends how big the chamber is, but the chamber mentioned in 2 would be fine, no flow restriction

2. More details please
You didnt give a pressure
but assuming 100psi, yes it will
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Unread postAuthor: OuchProgramme » Wed May 07, 2008 8:04 pm

1. Wouldn't effect preformance DRAMATICALLY
2. At 100 psi, it should launch further than only 100 meters
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Unread postAuthor: watto » Wed May 07, 2008 8:45 pm

sounds good, as long as the sprinkler is modified it should work well, I think 1.5m of 1/2 inch barrel would bend quite a bit though
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Unread postAuthor: TurboSuper » Wed May 07, 2008 8:56 pm

Well, generally its better for the barrel to be choking the valve's flow...positive pressure differential and all that.

As for question two...you can run the math on that one yourself. It also helps if your measurement units are conistent, btw.
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Unread postAuthor: The_Kangsta » Thu May 08, 2008 12:30 am

ok thanks for the help guys..
just needed some clarification for my next gun
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Unread postAuthor: Hydra » Thu May 08, 2008 5:05 am

My second Pneumatic is almost the same as yours. 1 metre (3 ft) of 25mm (1 inch) pipe for the chamber and a 1 inch Sprinkler with a 15mm barrel.
Doesnt do anything really.
Your barrel is pretty long though. Just run your design on GGDT. Ignore the 'Barrel Choking flow" warnings, they are negligible.
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Unread postAuthor: D_Hall » Thu May 08, 2008 8:33 am

[smartass]
If only there was some way to answer these questions....
[/smartass]
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Unread postAuthor: bikingpro911 » Thu May 15, 2008 7:54 pm

sounds reasonable to me...i like number 2 and there wouldnt have to be any reconstruction.



My second Pneumatic is almost the same as yours. 1 metre (3 ft) of 25mm (1 inch) pipe for the chamber and a 1 inch Sprinkler with a 15mm barrel.
Doesnt do anything really.
Your barrel is pretty long though. Just run your design on GGDT. Ignore the 'Barrel Choking flow" warnings, they are negligible.


i think he has the right idea
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